Skip to main content

front page news

All nodes that have this tag will posted to the home page "Recent Activity" block

Visual Observing Manual in German

A German translation of the AAVSO Manual for Visual Observing of Variable Stars is now available.

Many, many thanks to Ilka Petermann who volunteered a lot of time and effort to produce this translation.

CCD Photometry Guide in French

Thanks to a lot of hard work by a team of volunteers from both sides of the Atlantic working together, we now have a French translation of the AAVSO Guide to CCD Photometry.  You may download this Guide (free-of-charge) from here.

We would like to send our sincere thanks to:

Manon Bouchard (Canada)
Pierre Cheyssac (GAPRA, France)
Jean-Bruno Desrosiers (Canada)
Jean-Claude Mario (GAPRA, France)
Jean-Bernard Pioppa (GAPRA, France)
Florian Signoret (GAPRA, France)

Special Notice #426: Blazar CTA 102 (4C 11.69) in very bright outburst

December 1, 2016: The blazar CTA 102 (4C 11.69) has been in an active state in gamma-ray and optical wavelengths since 2015. During 2016, it has had numerous flaring episodes, particularly since late October. It is presently in an unprecedentedly bright optical state, and showing substantially increased emission in gamma-ray and near-infrared wavelengths.

Charts and Sequences Update November 2016

The charts and sequences team has been busy over the last several months preparing new sequences for newly discovered objects and revised sequences intended to improve existing sequences. If you observe any of these objects please update your charts and/or sequences. A file in .xlsx format is attached below for your convenience.

Name

Constellation

Work Performed

1RXS J012750.5+380830

And

new sequence

2MASS J04132921+3116279

And

new sequence

Solar Bulletin - Volume 72, Number 10

The October Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy: https://www.aavso.org/solar-bulletin

The October SID Data report is available here: https://www.aavso.org/sid-database

Alert Notice 562: Photometry of V725 Tau needed immediately

November 15, 2016: Dr. Franco Giovannelli (Istituto di Astrofisica e Planetologia Spaziali di Roma) has requested AAVSO assistance in monitoring V725 Tau, the Be star in the high-mass X-ray transient A0535+26/HDE245770, in order to plan for the X-ray outburst that follows 8 days after the optical brightening that occurs at periastron passage.

Periastron passage will occur on 16 November 2016, so coverage is needed beginning immediately and continuing for at least 15 days after periastron, until December 2.

Special Notice #425: FO Aqr XMM-Newton observations scheduled

November 9, 2016: Further to AAVSO Alert Notice 545, time series observations of the intermediate polar cataclysmic variable FO Aqr are requested to provide simultaneous coverage of XMM-Newton observations scheduled for 2016 November 13 19:43 UTC to November 14 8:13 UTC.

Alert Notice 561: Nova in Sagittarius = ASASSN-16ma = PNV J18205200-2822100

October 28, 2016

Event: Nova in Sagittarius

Discovered by:
 - ASAS-SN (K. Z. Stanek (Ohio State University) et al.; ATel #9669)
 - Yukio Sakurai (Mito, Japan; via TOCP page)

Discovery magnitude:
 - ASAS-SN: V~13.7, using quadruple 14-cm "Cassius" telescope at CTIO
 - Sakurai: 10.4 unfiltered CCD, using Nikon D7100 digital camera + 180-mm f/2.8 lens

Pages

AAVSO 49 Bay State Rd. Cambridge, MA 02138 aavso@aavso.org 617-354-0484